THE ORANGE THKTPS. 121 



when thus moistened and cuhivated, and thrips in this ground woukl 

 probably be broken from their small cells, if indeed they were able 

 to make cells at all in this soil, and many of them would be killed by 

 the cultivator and by the grinding together of the soil particles 

 during cultivation. On the other hand, in clay lands the particles 

 of soil pack closely together and form clods, and during cultivation 

 anj^ number of thrips within these clods might be repeatedly turned 

 over and over without injury. In this soil, too, it would be possible 

 for the thrips to make a strong. Avell-lined cell. 



Another fact in the cultivation of orange groves should be men- 

 tioned in this connection. After the trees have become large and 

 the fruit-laden limbs hang over and drag on the ground it seems 

 impossible to cultivate thoroughly close up to the tree, and there 

 may be an area of several square feet that is not disturbed during the 

 entire summer. This otfers an ideal breeding place for the thrips. 



REMEDIES. 



We are not able at this time to sa}^ what spray can be used to con- 

 trol this thrips, but a strong tobacco extract will doubtless prove 

 effective and will not hurt the tree. Some of the cheaper soap washes 

 ought also to be effective. 



ENEMY. 



It may be mentioned that a Tiiphleps^ presumably T. insidiosKs- 

 Say, is found everywhere feeding on the larvae of this thrips. 



DESCRIPTION. 



The following description of the female of E. cifrl has been made 

 after examination of many specimens. No males have yet been col- 

 lected. The insect is called citt-i because, so far as we knoAV, it feeds 

 on citrus trees only. 



Euthrips citri n. sp. 



Measurements : Head, length 0.75 mm., width 0.15 mm.; prothorax, 

 length 0.09 mm., width 0.18 mm. ; mesothorax, width 0.21 mm. ; abdo- 

 men, width 0.25 mm.; total body, length 0.86 mm. Antennae: 1, 12/x: 

 2, 36/x; 3, 39/*; 1, 39/*; 5, 30/*; 6, 31/*; T, 6/*; 8, 12/*; total, 0.205 mm. 

 Color, yellow to orange-brown, with thorax and segment 2 of antennae 

 more noticeably orange-brown. 



Head twice as wide as long, retracted considerably into the pro- 

 thorax, broadly rounded in front, with only slight depressions to 

 receive the basal joints of the antennae; two spines on anterior mar- 

 gin, other spines not conspicuous; cheeks almost straight and parallel. 

 Eyes large, occupying almost one-half the length of the head. 



